02755nas a2200217 4500008004100000022001400041245019900055210006900254260001200323300001400335490000800349520200400357653001402361653002002375653001302395653001402408653001602422100001802438700001602456856006502472 2017 eng d a0016-756800aThe agnostoid arthropod Lotagnostus Whitehouse, 1936 (late Cambrian; Furongian) from Avalonian Cape Breton Island (Nova Scotia, Canada) and its significance for international correlationAbstract0 aagnostoid arthropod Lotagnostus Whitehouse 1936 late Cambrian Fu c07/2016 a1001-10210 v1543 a

New and archival collections from the Chelsey Drive Group of the Avalon terrane of Cape Breton Island, Nova Scotia, Canada, yield late Cambrian trilobites and agnostoid arthropods with full convexity that contrast with compacted, often deformed material from shale and slate typical of Avalonian Britain. Four species of the agnostoid Lotagnostus form a stratigraphic succession in the upper Furongian (Ctenopyge tumidaParabolina lobata zones). Two species, L. ponepunctus (Matthew, 1901) and L. germanus (Matthew, 1901) are previously named; L. salteri and L. matthewi are new. Lotagnostus trisectus (Salter, 1864), the type species of the genus, is restricted to compacted material from its type area in Malvern, England. Lotagnostus americanus (Billings, 1860) has been proposed as a globally appropriate index for the base of ‘Stage 10’ of the Cambrian. All four species from Avalonian Canada are differentiated clearly from L. americanus in its type area in Laurentian North America (i.e., from debris flow blocks in Taconian Quebec). In our view, putative occurrences of L. americanus from other Cambrian continents record very different species. Lotagnostus americanus cannot be recognized worldwide, and other taxa should be sought to define the base of Stage 10, such as the conodont Eoconodontus notchhpeakensis.

10aAgnostida10aBiostratigraphy10aCambrian10aFurongian10aLotagnostus1 aWestrop, S.R.1 aLanding, E. uhttp://www.journals.cambridge.org/abstract_S0016756816000571